Geomechanics and Engineering

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Compressibility of fine-grained sediments based on pore water salinity changes

  • Junbong Jang (Department of ICT Integrated Safe Ocean Smart Cities Engineering, Dong-A University) ;
  • Handikajati Kusuma Marjadi (Department of ICT Integrated Safe Ocean Smart Cities Engineering, Dong-A University)
  • Received : 2022.11.28
  • Accepted : 2023.03.16
  • Published : 2023.04.25
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Abstract

Coastal and offshore structures such as ports and offshore wind farms will often need to be built on fine-grained sediments. Geotechnical properties associated with sediment compressibility are key parameters for marine construction designs especially on soft grounds, which involve clay-mineral dominated fines that can consolidate and settle significantly in response to engineered and environmental loads. We conduct liquid limit tests and 1D consolidation tests with fine-grained soils (silica silt, mica, kaolin and bentonite) and biogenic soils (diatom). The pore fluids for the liquid limit tests include deionized water and a series of brines with NaCl salt concentrations of 0.001 m, 0.01 m, 0.1 m, 0.6 m and 2.0 m, and the pore fluids for the consolidation tests deionized water, 0.01 m, 0.6 m, 2 m. The salt concentrations help the liquid limits of kaolin and bentonite decrease, but those of diatom slightly increase. The silica silt and mica show minimal changes in liquid limit due to salt concentrations. Accordingly, compression indices of soils follow the trend of the liquid limit as the liquid limit determined the initial void ratio of the consolidation test. Diatoms are more likely to be broken than clastic sediments during to loading, and diatom-rich sediment is therefore generally more compressible than clastic-rich sediment.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2021R1F1A1060406). I appreciate the researchers at U.S. Geological Survey: Dr. William F. Waite provided valuable comments on the experimental results, Lee-Gray Boze helped the experiments, and Laura L. Stern took SEM images.

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